Piston



GEORGE B. ROWAN, OF PORTLAND, OREGON.

PISTON.

Specification of Letters Patent.

Patented Jan. 1'7, 1922.

Application filed. February 26, 1921. Serial No. 448,146.

To all whom it may concern:

Be it known that I, Gnonon B. Rowan, a citizen of the United States, residing at Portland. in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

This invention relates to pistons especially adapted for use on internal combustion engines.

The principal object of the invention is to provide a light. durable piston which is adaptable for use with standard cylinders and which may be manufactured at a very reasonable cost.

The above and other objects of this invention will be in part described and in part understood from the following description of the present preferred embodiment of the invention taken in connection with the accompanying drawings, wherein:

Fig. 1, is a vertical sectional view of a piston constructed in accordance with this invention, and

Fig. 2, is a sectional view't-aken on the line 22 of Fig. 1, and looking in the direction of the arrow.

The piston constructed in accordance with this invention consists of a body generally designated 3, which may be of a cylindrical or any other desired configuration, one end thereof being closed as indicated at 4 and the opposite end open to receive the piston rod. The closed end of the body has its inner periphery thickened as indicated at 5 to provide a reinforced end. Piston rings (3 are mounted in the outer periphery of said reinforced end. A reinforcing annulus T is formed on the inner periphery of the open end of the body and has upstanding there from a plurality of fins such as that indicated at 8. These fins are of a width substantially equivalent to the width of the annulus 6 at the point where the fins and annulus merge. However, the fins gradually taper outwardly and have their inner ends engaged with bosses 9. The bosses 9 are formed at diametrically opposite points in the wall of the piston body and are engaged by an intermediate reinforcing ring 10. This ring likewise has fins upstanding therefrom, such as indicated at 11. These fins are of an arcuate configuration and extend over the thickened end 5 of the piston body and join in the center of said closed end 4 as shown in Fig. 1.

A reinforcing grid structure 12 is formed on the inner periphery of the piston 'body and has its inception at the thickened end 5 of the piston. The grid extends down wardly into engagement with the reinforcing annulus 7.

It is apparent from the above that a substantially hollow piston is provided which at the same time will possess the desired rigidity to make it effective in use, especially is this true by reason of the fact that the working end of the piston is reinforced by enlarging the same as indicated at 5, and by centrally connecting the fins l1, and engaging the latter with the inner face of the closed end 4 of the piston. It is of course to be understood that any desired shape grids may be used without the departing from the spirit of my invention.

WVhat is claimed is:

A piston including a hollow body closed at one end and having its inner periphery thickened at said closed end to reinforce the same, the opposite end of said piston having its inner periphery enlarged to provide a reinforcing annulus, fins upstanding from said annulus and terminating approximately midway the ends of the body, and a secondseries of fins having their in ception at approximately midway the ends of the cylinder and engaging the closed end thereof to reinforce the same.

In testimony whereof I aifix my signature in presence of two witnesses.

, GEORGE B. ROlVAN.

Witnesses:

C. R. FIELDING, M. M. PEARCY. 

